Parisienne V6-262 4.3L (1986)
Torque Converter Clutch: Testing and Inspection
Component Diagnostic Charts (C-Charts) - Throttle Body Fuel Injection
Fig. 004 - Wiring Diagram for Chart C-8 Transmission Converter Clutch. VIN Z
CHART C-8
TRANSMISSION CONVERTER CLUTCH (TCC)
4.3L ENGINE
FUEL INJECTION (TBI)
The purpose of the automatic transmission torque converter clutch feature is to eliminate the power loss of the torque converter stage when the vehicle
is in a cruise condition. This allows the convenience of the automatic transmission and the fuel economy of a manual transmission.
Fused battery ignition is supplied to the TCC solenoid through the TCC brake switch.
The ECM will engage TCC by grounding CKT 422 to energize the solenoid.
TCC will engage when:
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Vehicle speed above 30 mph (48 km/h).
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Engine at normal operating temperature (above 65°C) (149°F).
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Throttle position sensor output not changing, indicating a steady road speed.
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Brake switch Closed.
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3rd or 4th gears.